Smoking status was measured at the beginning of each laboratory session using self-reported smoking, in cigarettes per day since last session, and biochemical verification, in expired carbon monoxide (CO ppm). To ensure similar conditions of nicotine nondeprivation at their baseline (prequit) session, participants smoked one cigarette of their usual brand before completing the session questionnaires and viewing the affective slides. All participants were asked to limit their intake of caffeinated beverages to no more than two cups before 8:00 a.m. on the day of each laboratory session.
